Fuel valve for internal combustion engines



May 9, 1939. Q RETSCHY 2,157,571

FUEL VALVE FOR INTERNAL COMBUSTION ENGINES Filed July 9, 1938 INVENTOR ATTORNEYs Patented May 9, 1939 UNITED STATES PATENT QFFICE FUEL VALVE FOR- INTERNAL COll/[BUSTION ENGINES Curt Retschy, Winterthur, Switzerland, assignor to Sulzer Freres, Socit Anonyme, Winterthur, Switzerland Application July 9, 1938, Serial No. 218,320 In Switzerland July 13, 1937 3 Claims. (Cl. 267-1) This invention relates to a fuel valve for inter- The fuel which is introduced through the pipe nal combustion engines of the type having abar 9, 20, is forced out through the ducts of the spring, one end of which is mounted in and sefuel injection device 6, 2i. In the fuel valve 3 a cured to a housing, the opposite or flexible end begroove I1 is arran Which holds the Valve 5 ing in pressed engagement with the valve tappet. securely. Above the valve housing a yoke 23 is In the improved valve of the invention the bar arranged, which is secured by a screw device 24. has a shoulder arranged crosswise to the longi- In order to hold the spring I, a groove I5 can be tudinal axis of the bar on the secured or fixed provided. Any oil leaking out is led away end thereof, and the housing has a seat against through the piping 22. In addition, for securing which the shoulder makes contact. The tappet and fixing the valve 6 and for securing the stop 19 of the valve is arranged crosswise to the bar pin I8 for the yoke 23 a groove i6 can be prospring and the contact surface of the seat is vided.

preferably parallel to the aids of the tappet. The valve construction of the invention is rela- The valve has means for pressing the shoulder tively low, that is, it does not extend away from against the bar. In a preferred construction the the cylinder jacket any appreciable distance and bar has an eccentric projection or bearing surmay be dismantled or assembled in a relatively face on its fixed end against which a screw in small space. The mounting arrangement at the the housing makes pressed engagement, thereby fixed end of the bar, whereby the fiat shoulder is forcing the shoulder against the seat. forced against the seat, prevents a lateral dis- The mounting of the bar in the housing makes placement and jamming of the valve tappet when 20 it possible to prevent longitudinal displacement the rod is inserted, and the application of force of the bar and resulting jamming of the tappet, eccentrically with respect to the contact surface on insertion of the bar, and the eccentric appliof the shoulder .increases the lever arm of the cation of pressure by the screw on the bearing moment of force acting against the spring bendsurface of the fixed end of the bar increases the ing moment. 25

lever arm of the moment of the force acting I claim: against the spring bearing moment. 1. In a fuel valve for internal combustion en- The single figure of the accompanying drawgines of the type having a bar spring one end of ing illustrates an embodiment of avalve construcwhich is secured or fixed in a housing and the tion in accordance with the invention in which other end in engagement with a tappet of the 30 certain parts are shown in section. valve the axis of which extends crosswise to the As illustrated in the drawing, portions of the axis of the bar spring, the improvement which cylinder I and the cylinder jacket 2 of the opcomprises a shoulder on the fixed end of the bar posed piston engine are shown having suitable spring forming a contact surface which is crossopenings therein for a valve mounting-member wise to the longitudinal axis of the bar spring, 35 3 in which is secured a needle valve 4 actuated said housing having a seat the bearing surface by a tappet 5. A housing 6 is attached to the of which is substantially parallel to the axis of the valve and has a bar spring I mounted therein Valve tappet, and means for forcing the contact extending crosswise to the axis of the tappet. surface of the shoulder into pressed engagement The fixed end of the bar spring has a flat shoulwith the seat. 40 der 8 constructed crosswise to its longitudinal 2. A fuel valve according to claim 1 in which axis. The housing is formed to provide a fiat the bar spring has a bearing surface against seat 9 against which the shoulder of the spring which the force is applied which is eccentric to is pressed. The extreme end of the spring bar the contact surface of the shoulder.

has a bearing surface IIJ eccentric with respect 3. A fuel valve according to claim 1 in which 5 to the contact surface of the shoulder and a the bar spring has a bearing surface which is screw I I is threaded into the end of the housing eccentric to the contact surface of the shoulder, and adapted to apply pressure against the eccenand a screw in the housing adapted to engage tric bearing surface. The flexible end I2 of the the bearing surface, thereby applying the force bar has a socket I3 formed at the under end-porpressing the shoulder into engagement with the 50 tion which is adapted to make contact with and seat. center the upper end of the tappet 5. CURT RETSCHY. 

